JP5944169B2 - Electric compressor - Google Patents

Description

  The present invention relates to an electric compressor including a motor controlled by a drive circuit such as an inverter.

  An electric compressor mounted on a vehicle or the like is provided with an airtight terminal portion having a connector terminal for inputting an output current from an inverter to a motor winding via a lead pin (electric conduction portion) of a hermetic plate. In such a case, it is a common practice to fix the connector terminals to the hermetic plate using a cluster housing that houses a plurality of connector terminals.

  The hermetic terminal portion is provided in the compressor housing (sealed container) in order to form the electric compressor in a small size. A refrigerant as a fluid to be compressed flows in the compressor housing. However, if the hermetic terminal part is completely sealed and cut off so that liquid refrigerant does not flow into the hermetic terminal part, the airtight terminal part is not sealed between the inside and the outside. Will cause a pressure difference. Thus, attempts have been made to provide through holes that allow liquid refrigerant to enter and exit the inside and outside of the airtight terminal portion.

  However, if a through hole is provided to communicate the hermetic container of the compressor and the hermetic terminal part, the liquid refrigerant enters the hermetic terminal part through the through hole, so that poor insulation tends to occur inside the hermetic container. In order to avoid such an insulation failure, the electric compressor described in Patent Document 1 is provided with a predetermined insulation distance extension to ensure insulation.

JP 2009-293598 A

  Since the insulation distance extension provided in the electric compressor described in Patent Document 1 has a slightly complicated structure, it obstructs the downsizing of the compressor. Further, the provision of the insulating distance extension portion may cause a disadvantage in manufacturing the compressor that the processing of the compressor constituent members and the assembly of the compressor are likely to be complicated.

  Accordingly, an object of the present invention is to provide an electric compressor that is easy to manufacture and that can ensure the insulation inside the compressor while equalizing the pressure inside the compressor.

In order to solve the above problems, an electric compressor according to the present invention is an electric compressor in which a motor driven and controlled by a drive circuit drives a compression mechanism to compress refrigerant, and the current output of the drive circuit A lead pin connected to the part, and a connector capable of conducting the current output part of the drive circuit and the current input part of the motor by being attached to the lead pin,
The connector has a connector terminal that comes into contact with the lead pin when mounted on the lead pin, a connector housing that houses the connector terminal, a vacuum suction passage that communicates the inside and the outside of the connector housing, and the vacuum suction flow A sealing member for sealing between the path and the connector housing is provided.

  In such an electric compressor of the present invention, a vacuum suction flow path that communicates the inside and the outside of the connector housing is provided, and the space between the vacuum suction flow path and the connector housing is sealed with a sealing member. Even when liquid refrigerant flows into the connector housing, the conductive path can be kept only in the evacuation flow path, and as a result, it is possible to achieve both pressure equalization and insulation in the compressor. Become.

  In such an electric compressor of the present invention, it is preferable that an electrical insulator is interposed between the connector housing and the lead pin. By providing such an electrical insulator, current leakage from the lead pin connected to the drive circuit side of the connector housing can be prevented.

  The sealing member is preferably made of an electrical insulator. For example, the insulation of the connector housing itself can be effectively ensured by forming the sealing member with an insulating rubber material. The material of the electrical insulator interposed between the connector housing and the lead pin may be different from the material of the sealing member, but if both are formed of the same material, an increase in material cost can be suppressed. .

  In the electric compressor according to the present invention, it is preferable that the evacuation flow path includes a gap of a wire bundle that conducts the connector terminal and the current input portion of the motor. By securing the evacuation flow path using such a gap of the conductor bundle, the cross-sectional area of the liquid refrigerant flowing into the connector housing can be minimized. Specifically, it is possible to easily form a fine evacuation flow path by directly taking out several relatively large-diameter motor windings and drawing them to the connector terminal.

  The present invention can exert a remarkable effect when the connector housing is formed of a cluster housing that accommodates a plurality of connector terminals. By applying the present invention to the electric compressor provided with the cluster housing, it is possible to more efficiently ensure the insulation of the hermetic terminal portions concentrated in one place.

  The present invention is particularly preferably applied to an electric compressor whose interior is lubricated by a polyalkylene glycol-based lubricating oil (PAG oil). When a PAG oil having a lower insulating property than a polyol ester-based lubricating oil (POE oil) is used as a lubricating oil, an insulation failure is likely to occur in the connector housing, so that the effects of the present invention are more remarkable. Expectation is expected.

  According to the present invention, since it is possible to avoid a decrease in electrical insulation due to the refrigerant or lubricating oil flowing into the connector housing, when using PAG oil as the lubricating oil or under higher voltage operating conditions. In addition, it is possible to provide an electric compressor in which sufficient electrical insulation is ensured.

It is a schematic longitudinal cross-sectional view which shows the electric compressor which concerns on one embodiment of this invention. FIG. 2 is a partially enlarged longitudinal sectional view showing the vicinity of a connector terminal of the electric compressor of FIG. 1. The connector housing and connector terminal which comprise the electric compressor of FIG. 1 are shown, (A) is a top view, (B) is a front view. 1A and 1B show a mounting operation of a connector housing constituting the electric compressor of FIG. 1, (A) is a perspective view illustrating a sealing member mounting step, and (B) is a perspective view illustrating a plate mounting step. It is a partial expanded longitudinal cross-sectional view which shows the connector terminal vicinity of the electric compressor which concerns on the other embodiment of this invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing an electric compressor 1 according to an embodiment of the present invention. The main shaft 3 that is rotationally driven by the motor 2 rotates the movable scroll 4, whereby the refrigerant is compressed in the compression mechanism 6 including the movable scroll 4 and the fixed scroll 5. A current is input to the motor 2 through the motor conducting wire 7, and the main shaft 3 is rotationally driven by rotating the rotor 8 relative to the stator 9 by the action of a magnetic field generated by the input current.

  The motor lead 7 is covered with several motor windings directly, leaving the tip, and is connected to the connector terminal 11 via a vacuum pulling channel 10 consisting of a gap of the exposed lead bundle at the tip. It is connected to the. The connector terminal 11 is accommodated in the connector housing 12, and the refrigerant and the lubricating oil flowing in the electric compressor 1 can flow into the connector housing 12 through the evacuation channel 10.

  The connector terminal 11 is connected to a lead pin 15 of a hermetic plate 14 provided in a current output portion of an inverter 13 as a drive circuit for driving the motor 2. The connector housing 12 is formed so as to be attachable to an annular insulator 16 arranged around the hermetic plate 14 of the lead pin 15, and an electrical insulator is provided between the connector housing 12 and the lead pin 15 to seal the attachment site. A sealing member 17 made of rubber is interposed.

  FIG. 2 is a partially enlarged longitudinal sectional view showing the vicinity of the connector terminal 11 in the electric compressor 1 of FIG. Since the evacuation channel 10 formed as a gap of the wire bundle at the tip of the motor lead 7 communicates the inside and the outside of the connector housing 12, the refrigerant and lubrication introduced into the system of the electric compressor 1. Oil can flow into the connector housing 12 through the evacuation channel 10. In order to introduce the refrigerant into the system as an operation before the operation of the electric compressor 1 is started, the system is evacuated. At this time, the connector housing 12 is also evacuated through the evacuation channel 10. Is formed. Subsequently, when the refrigerant is introduced into the system, the refrigerant and the lubricating oil flow into the connector housing 12 through the evacuation channel 10. In this embodiment, since the sealing member 18 made of rubber as an electrical insulator is interposed between the vacuum suction channel 10 and the connector housing 12, the refrigerant or lubricating oil passes through only the vacuum suction channel 10 and is connected to the connector. It is prevented from flowing into the housing 12 and flowing into the connector housing 12 from other paths. In this way, the system pressure of the electric compressor 1 is made uniform, and electrical insulation around the connector terminal 11 is sufficiently secured.

  FIG. 3 shows a connector housing 12 and connector terminals 11 constituting the electric compressor 1 of FIG. 1, wherein (A) is a plan view and (B) is a front view. In this embodiment, the connector housing 12 has a so-called cluster housing shape, and includes a plurality of accommodating portions that accommodate a plurality of connector terminals.

  FIG. 4 shows the mounting operation of the connector housing 12 constituting the electric compressor of FIG. 1, and FIG. 4A is a perspective view for explaining a sealing member mounting process for mounting the sealing member 17 to the hermetic plate 14. ) Is a perspective view illustrating a plate mounting process for mounting the connector housing 12 to the hermetic plate 14. An annular insulator 16 disposed around the lead pin 15 and an annular sealing member 17 fitted to the insulator 16 are interposed between the lead pin 15 and the connector housing 12. As described above, the mounting portion of the connector housing 12 is hermetically sealed using only an electric insulator, thereby ensuring electric insulation.

  FIG. 5 is a partially enlarged longitudinal sectional view showing the vicinity of a connector terminal in an electric compressor 21 according to another embodiment of the present invention. Although the connector terminal and the vacuum channel are accommodated in the connector housing 22, illustration is omitted. In this embodiment, a parallel arrangement is adopted in which the lead pins 25 and the evacuation flow path are aligned, and in this respect, an orthogonal arrangement is adopted in which the lead pins 15 and the evacuation flow path 10 are substantially orthogonal. Different from the embodiment of FIG. Since the other points are the same as those in the embodiment of FIG. 2, the same parts numbers are assigned to the corresponding parts, and the description is omitted.

  The electric compressor according to the present invention can be used as a scroll type electric compressor or the like mounted on an electric vehicle or the like.

DESCRIPTION OF SYMBOLS 1, 21 Electric compressor 2 Motor 3 Main shaft 4 Movable scroll 5 Fixed scroll 6 Compression mechanism 7 Motor conducting wire 8 Rotor 9 Stator 10 Vacuum pulling passage 11 Connector terminal 12, 22 Connector housing 13 Inverter 14 Hermetic plate 15, 25 Lead pin 16 17, 18 Sealing member

Claims (4)

A motor driven and controlled by a drive circuit is an electric compressor that compresses refrigerant by driving a compression mechanism, and the lead pin connected to the current output portion of the drive circuit and the lead pin are attached to the lead pin. A connector capable of conducting the current output part of the drive circuit and the current input part of the motor;
Said connector, said connector terminals in contact with the lead pin at the time of attachment to the lead pins, and a connector housing for accommodating the connector terminal, and communication between the inside and the outside of the connector housing wherein the connector terminal and the current input of the motor a vacuum passage ing from voids exposed conducting wire bundles to conduct, in that it comprises a sealing member formed of an insulating rubber material for sealing between the connector housing and the vacuum evacuation channel A featured electric compressor.   The electric compressor according to claim 1, wherein an electrical insulator is interposed between the connector housing and the lead pin. The connector housing is comprised of a cluster housing accommodating a plurality of connector terminals, electric compressor according to claim 1 or 2. The polyalkylene glycol lubricant in the system are lubricated, electric compressor according to any one of claims 1-3.

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